schneider-electric
Schneider Electric Blokset Main Distribution Switchboard
Model: BST4000EN4
4-hour response · Pricing in SAR · Delivery across all KSA regions
BST4000EN4 — Schneider Electric Blokset Main Distribution Switchboard
The Schneider Electric Blokset is a low-voltage main distribution switchboard system covering incomer ratings from 4000 A to 6300 A, engineered for the most demanding main distribution applications in large industrial facilities, power generation plants, and utility infrastructure where the switchboard must handle the full output current of large power transformers or generator sets at 400 V or 690 V AC. The Blokset's rigid bolted busbar construction uses silver-plated copper busbars with a cross-sectional area matched to the rated current, providing the thermal and electrodynamic short-circuit withstand capability required at the main incomer of large power distribution systems where available fault currents may reach 100 kA.
The Blokset accommodates MasterPact MTZ air circuit breakers as the incoming and outgoing main devices, with optional bus coupler breaker between two incoming supply sections to enable closed or open bus operation. The integrated Micrologic X trip units in MasterPact MTZ provide arc flash detection, IEC 61850 zone selective interlocking, and EcoStruxure Power cloud monitoring from the switchboard's main circuit breakers without additional hardware. The enclosure structure is IEC 61439-2 Form 2b or Form 4 certified, with IP31 to IP54 protection options and forced cooling for high current ratings where convection cooling is insufficient.
In Saudi Arabia, the Blokset KSA serves the main distribution switchboard market for facilities with transformer ratings above 2000 kVA, where 4000–6300 A incoming ratings are required. Large power plants, heavy industrial complexes at Jubail and Yanbu, and major infrastructure facilities including international airports and hospital complexes with multiple transformers use Blokset as the main LV distribution centre. SEC's large substation LV main distribution centres and ARAMCO's plant site-wide main distribution switchboards specify Blokset or equivalent 4000–6300 A main distribution switchgear. Vision 2030's large-scale infrastructure projects including NEOM and the Red Sea Project's utility infrastructure use Blokset for main LV distribution.
Razz Middle East provides Blokset project support including busbar sizing calculations, transformer let-through current coordination, MasterPact MTZ specification, Micrologic X setting coordination, and supply chain management for large switchboard projects across Saudi Arabia.
Technical Specifications
Full specifications for the BST4000EN4
- Incomer Rating
- 4000–6300 A
- Voltage
- 400 V / 690 V AC
- Short-Circuit Withstand
- Up to 100 kA
- Busbars
- Silver-plated copper, bolted construction
- Main Devices
- MasterPact MTZ ACBs
- Bus Coupler
- Optional closed/open bus operation
- Form
- IEC 61439-2 Form 2b / Form 4
- Protection
- IP31–IP54
Key Features & Benefits
- Silver-plated copper busbar bolted construction provides certified short-circuit withstand of up to 100 kA, covering the maximum fault current available from large MV/LV transformers at Saudi industrial facilities.
- MasterPact MTZ ACB integration brings arc flash detection, IEC 61850 GOOSE ZSI, and EcoStruxure cloud monitoring to the main distribution level, providing the highest available protection and monitoring capability.
- Bus coupler ACB between incoming supply sections enables closed-bus parallel operation of two transformers or open-bus manual/automatic source selection for high-availability distribution systems.
- Forced cooling option for 5000–6300 A ratings maintains busbar temperature within IEC 61439-2 limits when convection cooling is insufficient at maximum continuous loading in high-ambient Saudi electrical rooms.
- IEC 61439-2 Form 4 certification option provides complete compartment separation between functional units for live maintenance operations at critical facilities requiring zero-downtime maintenance.
- Modular extension capability allows Blokset to be extended with additional outgoing sections as facility load grows, protecting the original switchboard infrastructure investment during plant expansion.
- Compatible with Schneider Electric's full LV circuit protection range for outgoing circuits, enabling a single coordinated Schneider Electric distribution system from main Blokset incomer to Acti9 final circuit MCBs.
Industrial Applications in Saudi Arabia
- ARAMCO plant site-wide main LV distribution centres at Eastern Province production facilities, where 4000–6300 A incomer ratings distribute transformer output across multiple MCC and distribution board outgoing circuits.
- SEC large substation LV main distribution switchgear at 132/11 kV and 33/11 kV grid substations, where Blokset's 100 kA withstand capability and MasterPact MTZ arc flash detection satisfy SEC's main distribution standard.
- SABIC Jubail petrochemical complex main LV power distribution where multiple large transformers paralleled on a common Blokset busbar supply the facility's production areas, utilities, and administration complex.
- NEOM utility infrastructure main LV distribution centres for the city's large substation cluster, where Blokset provides the main busbar for distribution of utility-scale solar farm output to NEOM's LV network.
- King Abdulaziz International Airport Jeddah expansion main electrical distribution, where Blokset's Form 4 construction and arc flash protection satisfy ICAO airport electrical safety requirements.
- Large hospital main distribution centre at major Ministry of Health facility projects where multiple generator sets and utility transformers are paralleled on a common Blokset main busbar for maximum supply reliability.
- Large industrial facility power generation plant auxiliary LV distribution centre, where Blokset distributes generator output to plant MCCs, emergency lighting, and control building supplies via outgoing MasterPact feeder breakers.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — BST4000EN4
Common questions from buyers in Saudi Arabia and the GCC